Trivers 1971: cooperation evolves between unrelated individuals via repeated-encounters + memory + retaliation; basis of indirect-reciprocity (Nowak-Sigmund 2005) + iterated PD strategies.
Trivers 1971: cooperation evolves between unrelated individuals via repeated-encounters + memory + retaliation; basis of indirect-reciprocity (Nowak-Sigmund 2005) + iterated PD strategies.